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add diagram
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Controls the VFD display of WACCA cabinet from an Arduino.
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[example video](https://twitter.com/akasaka_spk/status/1659505635078311936)
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## Schematic
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(sorry, no picture)
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![schematic](sch/schematic.png)
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Rx,Tx of Arduino Pro Micro -> MAX232 -> Tx,Rx of VFD display (COM2 cable on WACCA cabinet)
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Pin 2 of Arduino -> Coin selector (N-O contact)
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Gnd of Arduino -> Coin selector (COM contact)
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For other connections around MAX232 see tutorials online such as the one in [DIYODE Magazine](https://diyodemag.com/education/the_classroom_rs232_the_max232_ic_arduino_uno).
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For RS232 pinout see e.g. [PinoutGuide](https://pinoutguide.com/SerialPorts/Serial9_pinout.shtml)
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